{"title":"DS-CDMA的相干解调级联编码扩展","authors":"T. Frey, P. Schramm","doi":"10.1109/VETEC.1998.686088","DOIUrl":null,"url":null,"abstract":"In DS-CDMA systems, spreading may be viewed as inner coding and user-specific scrambling. In practice, spreading is combined with an outer convolutional code, which leads to so-called concatenated coded spreading (CCS). The standard approach is to use repetition codes. In the IS-95 uplink, a (64,6,32) orthogonal code is defined, which can be interpreted as 64-ary orthogonal modulation. In this paper, a CCS scheme with power efficiency superior to the IS-95 uplink is proposed. The use of decision-directed coherent demodulation for both schemes is discussed, and it will be shown that the coding gain of the improved CCS requires a modified channel estimation scheme.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"28 9 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":"{\"title\":\"Concatenated coded spreading with coherent demodulation for DS-CDMA\",\"authors\":\"T. Frey, P. Schramm\",\"doi\":\"10.1109/VETEC.1998.686088\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In DS-CDMA systems, spreading may be viewed as inner coding and user-specific scrambling. In practice, spreading is combined with an outer convolutional code, which leads to so-called concatenated coded spreading (CCS). The standard approach is to use repetition codes. In the IS-95 uplink, a (64,6,32) orthogonal code is defined, which can be interpreted as 64-ary orthogonal modulation. In this paper, a CCS scheme with power efficiency superior to the IS-95 uplink is proposed. The use of decision-directed coherent demodulation for both schemes is discussed, and it will be shown that the coding gain of the improved CCS requires a modified channel estimation scheme.\",\"PeriodicalId\":335954,\"journal\":{\"name\":\"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)\",\"volume\":\"28 9 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1998-05-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"6\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/VETEC.1998.686088\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/VETEC.1998.686088","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Concatenated coded spreading with coherent demodulation for DS-CDMA
In DS-CDMA systems, spreading may be viewed as inner coding and user-specific scrambling. In practice, spreading is combined with an outer convolutional code, which leads to so-called concatenated coded spreading (CCS). The standard approach is to use repetition codes. In the IS-95 uplink, a (64,6,32) orthogonal code is defined, which can be interpreted as 64-ary orthogonal modulation. In this paper, a CCS scheme with power efficiency superior to the IS-95 uplink is proposed. The use of decision-directed coherent demodulation for both schemes is discussed, and it will be shown that the coding gain of the improved CCS requires a modified channel estimation scheme.
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